Esthetic numbers: Difference between revisions
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(→{{header|Haskell}}: added solution) |
m (→{{header|Haskell}}: minor typos) |
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=={{header|Haskell}}== |
=={{header|Haskell}}== |
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<lang haskell>import Data.List (unfoldr, genericIndex) |
<lang haskell>import Data.List (unfoldr, genericIndex) |
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import Control.Monad (replicateM, foldM, |
import Control.Monad (replicateM, foldM, mzero) |
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-- a predicate for esthetic numbers |
-- a predicate for esthetic numbers |
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-- representation of numbers as digits |
-- representation of numbers as digits |
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fromBase b = foldM f 0 |
fromBase b = foldM f 0 |
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where f r d | d < 0 || d >= b = |
where f r d | d < 0 || d >= b = mzero |
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| otherwise = |
| otherwise = pure (r*b + d) |
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toBase b = reverse . unfoldr f |
toBase b = reverse . unfoldr f |
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